How to find the circumference and area of ​​a circle in c language

In C language, use the following formulas to calculate the circumference and area of ​​a circle: circumference = 2 π radius, area = π * radius ^ 2.

How to calculate the circumference and area of ​​a circle using C language

In C language, you can use the following formula Calculate the circumference and area of ​​a circle:

Perimeter

<code>周长 = 2 * π * 半径</code>

Area

<code>面积 = π * 半径 ^ 2</code>

Where, π (pi) is A constant of approximately 3.14159.

Implementation code
The following is a C language sample code for calculating the circumference and area of ​​a circle:

<code class="c">#include <stdio.h>

int main() {
  // 定义圆的半径
  float radius;

  // 提示用户输入半径
  printf("请输入圆的半径：");
  scanf("%f", &radius);

  // 计算圆的周长和面积
  float circumference = 2 * 3.14159 * radius;
  float area = 3.14159 * radius * radius;

  // 打印结果
  printf("圆的周长：%.2f\n", circumference);
  printf("圆的面积：%.2f\n", area);

  return 0;
}</code>

Sample output

<code>请输入圆的半径：10
圆的周长：62.83
圆的面积：314.16</code>

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